The SS Fort Stikine, a 7,142 gross ton freighter sailed from Birkenhead, England on February 24 via Gibraltar and reached Karachi on March 30 where she unloaded some of her cargo which consisted of but not limited to crated spitfires, munitions, scrap iron, gold bars and around 1,400 tons of explosive. To fill up the empty hold sulphur, cotton bales, timber, lubricating oil drums, turpentine, fish manure, rice and resin etc were also loaded at Karachi flouting all the norms. The ship arrived at Bombay on April 12 but the unloading started on April 14 only.
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Source of Info: Wikipedia (Also see note below.)
More info: http://www.merchantnavyofficers.com/bomEx.html